<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-if="list.length">
          <tr v-for="(item,index) in list" :key="item.id">
            <td>{{ item.id }}</td>
            <td>{{ item.name }}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="item.price > 100 ? 'red' : ''" >{{ item.price }}</td>
            <td>{{ item.time | forTime }}</td>
            <td><a href="#" @click="del(index)">删除</a></td>
          </tr>
          <tr>
           <td >汇总</td>
           <span style="display:none">{{ tota() }}</span>
           <td colspan="2">总价：{{total}}</td>
           <td colspan="2">均价：{{rate}}</td>
          </tr>
        </tbody>
          
        <tfoot v-else>
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
           
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model.trim="name"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model.number="price"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="add">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>

import moment from 'moment'
export default {
  data() {
    return {
     rate:'',
     total:'',
     name:'',
     price:'',
      // 资产列表数组
      list: [
        { id: 100, name: "外套", price: 199, time: new Date('2010-08-12')},
        { id: 101, name: "裤子", price: 34, time: new Date('2013-09-01') },
        { id: 102, name: "鞋", price: 25.4, time: new Date('2018-11-22') },
        { id: 103, name: "头发", price: 19900, time: new Date('2020-12-12') }
      ],
    };
  },
  methods:{
   add() {
    if(!this.name || !this.price) {
     return alert('资产名称和价格不能为空！')
    }
    let id = this.list.length === 0 ? 100 : this.list[this.list.length - 1].id + 1
    let obj = {
     id,
     name:this.name,
     price:this.price,
     time:new Date()
    }
    this.list.push(obj)
    this.name = this.price = ''
   },
   del(index) {
    this.list.splice(index)
   },
   tota() {
      this.total = this.list.reduce((sum,obj) => sum + obj.price,0)
      this.rate = this.total / this.list.length
    }
  },
  filters: {
   forTime(date) {
    return  moment(date).format('YYYY-MM-DD')
   }
  }
};
</script>

<style >
.red{
  color: red;
}
</style>